Level gauge



FIG. 1 is a top plan view of a level gauge showing our new design;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is a front elevational view, the rear elevational view being a mirror image thereof;

FIG. 4 is a left side elevational view thereof; and,

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a level gauge, as shown and described. 